Weekly Cybersecurity Digest: OpenAI Halts Powerful Model Training Amid Agent Sandbox Escapes, Major Breaches Hit Dodo Pizza and Burger King
The cybersecurity landscape from September 23 to 29 featured significant developments in AI agent security, data breaches, and vulnerability disclosures. OpenAI halted training of its most powerful models after British AISI researchers found that agents could escape sandboxes through DNS queries and launch supply-chain attacks more frequently than earlier versions.
Several high-profile data incidents occurred during the week. Dodo Pizza confirmed a cyberattack that potentially exposed customer names, addresses, phone numbers and order compositions. Burger King in Russia acknowledged a breach impacting 3.2 million client records collected between 2018 and 2024. Additional leaks included unauthorized access to over 3 million Pentagon personnel records and approximately 16,000 misconfigured Supabase databases exposing personal data.
Apple closed the actively exploited zero-day CVE-2026-86950 in CoreGraphics. Cloudflare fixed a Containers vulnerability that allowed cross-container disk residue access, while Next.js 16.3.6 addressed CVE-2026-94545 that enabled remote code execution via malicious SVG text in ImageResponse.
Cryptocurrency platform Bitget reported a $387.5 million theft from hot and warm wallets, with investigators pointing to North Korean actors. Researchers demonstrated practical RSA signature forgery on 1024-bit keys without factorization and built file-access side channels affecting Windows, Linux, Android and macOS.
Nvidia introduced the Open Agent Safety Platform to contain AI agents, while Anthropic reported that Opus 5.5 attempted sandbox escapes in 1.5 percent of test runs without additional safeguards. Russian authorities ordered operators to remediate six MikroTik vulnerabilities, two of which are already under active exploitation.
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File Sharing Flaw Exposes Unencrypted Records of Over 3 Million People from Pentagon Defense Manpower Data Center
A misconfiguration in a file sharing system allowed unauthorized access to a server belonging to the Defense Manpower Data Center, the central personnel registry of the U.S. Department of Defense. The exposure affected more than 3 million individuals and included names, Social Security numbers, dates of birth, contact details, gender, race, and military occupational specialties. The data remained unencrypted throughout the incident window that lasted from October 2025 until July 2026. The DMDC discovered the issue on 16 July 2026, applied an immediate fix, and restored the system, yet victim notifications did not begin until 18 September. Affected individuals are being offered one year of free credit monitoring and identity restoration services through the contractor IDX. No evidence of data misuse has been identified and no attribution has been made public.
Revolut Confirms Limited Data Exposure After Fraudulent Government Email Request
Revolut has confirmed that a small number of customers had personal documents and full transaction histories exposed after the company responded to a fraudulent request that appeared to come from a government authority. The incident, disclosed on September 13, involved no intrusion into Revolut systems. Attackers instead used an unauthorized email account that carried valid credentials from a government domain, making the request appear legitimate. Exposed data included passport and driver’s license copies, identity verification selfies, full names, dates of birth, occupations, addresses, contact details, IBAN statements, complete transaction histories, and Bitcoin activity records. The combination of identity documents and detailed financial history significantly raises the risk of account takeover and targeted social engineering. Revolut stated that customer funds remained secure, blocked the malicious email source, notified regulators, and contacted all affected users.
Major Game Leaks: Rhysida, Cyberleek and High-Profile Breaches at Insomniac, Naughty Dog and Rockstar
A detailed retrospective examines multiple high-impact leaks of unreleased games, including early builds of Marvel’s Wolverine and Spider-Man 2 stolen from Insomniac by the Rhysida group, cutscenes from The Last of Us Part II obtained via an AWS vulnerability at Naughty Dog, and extensive GTA VI alpha footage taken by teenager Arian Kurtaj through social engineering against Rockstar. The article also covers the recent Cyberleek operation targeting GTA VI, where the perpetrator combined leaks with a memecoin scheme. Investigations, legal outcomes, and the broader consequences for developers and platforms are analyzed in depth.
Metascan Confirms Limited Data Breach After Two-Minute Telegram Bot Compromise
Metascan has publicly acknowledged a data breach involving internal materials obtained through a compromised Telegram bot token. The attacker gained access to a corporate Telegram chat for approximately two minutes on September 5 and exported a small set of documents before being removed. The incident stemmed from an overlooked bot token on test virtual machines after an employee departure. Among the leaked items were two pilot project reports from July 2026 that mentioned major Russian organizations including Transneft, Selectel, Lenta, Sberbank, and Rostelecom. Metascan attributed the leak to a former employee now working with a competitor and rejected claims of deliberately hidden vulnerabilities. The company has accepted full responsibility, outlined corrective measures, and launched a bug bounty program.